最小和最大日期 - 分组排

Question

我有一个表“A”作为图像中，我需要创建一个视图来组的数据作为表“B”。 有什么建议吗？我欣赏每一个输入来提高我的技能 感谢

table

Answer 1

这应做到：

SELECT [USER], 
     [ACTIVITY], 
     MIN([HOUR]) AS [START], 
     MAX([HOUR]) AS [END], 
     RIGHT('0'+CAST(DATEDIFF(SECOND, CAST(MIN([HOUR]) AS TIME), CAST(MAX([HOUR]) AS TIME))/3600 AS VARCHAR), 2)+':'+RIGHT('0'+CAST((DATEDIFF(SECOND, CAST(MIN([HOUR]) AS TIME), CAST(MAX([HOUR]) AS TIME))/60) % 60 AS VARCHAR), 2) AS [MINUTE] 
FROM TAB_A 
GROUP BY [USER], 
     [ACTIVITY];